Tag Archives: ethics and climate change science

This is the second in a three part series examining the ethical and justice issues discussed by the IPCC Working Group III in its 5th Assessment Report (AR5) . In the first entry in this series we concluded that although the recent IPCC AR 5 Working Group III report is laudable improvement over prior IPCC reports in regard to identifying ethical and equity issues that should be considered in developing climate change policy, some criticisms are also warranted of how IPCC has articulated the significance and implications of the ethical, justice, and equity principles that should guide nations in developing climate change policies.

In short, we will argue improvement is possible in how IPCC deals with ethics, justice, and equity issues entailed by climate change policy-making despite very significant improvements on these matters in the AR5 report compared to prior IPCC reports.

In this entry we will examine several preliminary ethical and justice issues raised by the new IPCC Working Group III Chapter 3, on Social, Economic, and Ethical Concepts. The last entry will continue the examination Chapter 3 and then turn to Chapter 4 on Sustainable Development and Equity.

As a preliminary matter, one of the challenges that IPCC faces in its mandate on of ethics and justice issues relevant to climate change policy-making is that it is not IPCC’s role to be prescriptive in deciding what governments should do. It’s mandate is to synthesize the extant social-economic and scientific literature for policy-makers. In this regard, the IPCC chapter on ethics said expressly:

This chapter does not attempt to answer ethical questions, but rather provides policymakers with the tools (concepts, principles, arguments, and methods) to make decisions. (IPCC, 2014.WG III, Ch. 3, pg. 10)

And so it is not IPCC’s role to do ethical analyses of policy issues that raise ethical questions. IPCC can, however, distinguish between prescriptive and descriptive questions that arise in relevant socio-economic literature about climate policy-making, identify important ethical and justice issues that arise in this literature, where there is a consensus on ethics and justice issues in the relevant literature describe the consensus position, where there is no consensus on ethical and justice issues describe the range of reasonable views on these issues, and identify hard and soft law legal principles relevant to how governments should resolve ethical and justice issues that must be faced by policy-makers.

There are several subjects in climate change policy-making which raise important ethical and justice issues. They include policy judgements about:

how much warming will be tolerated, a matter which is implicit but rarely identified when nations make ghg emissions reduction commitments,

any nation’s fair share of safe global emissions, matters which are referred to by the IPCC usually as burden-sharing or effort-sharing considerations and a matter taken up in chapter 4 of IPCC, Working Group III chapter on sustainability and equity,

any nation’s responsibility for funding reasonable adaptation and compensation for losses and damages for those who are harmed by climate change,

when a nation is responsible for its ghg emissions given differences in historical and per capita emissions among nations,

responsibility for funding technology transfer to poor nations,

how to evaluate the effects on and responsibilities to others of climate change technologies that are adopted in response to the threat of climate change, including such technologies as geo-engineering or nuclear power, for instance,

who has a right to participate in climate change policy-making, a topic usually referred to under the topic of procedural justice,

the responsibility of not only nations but subnational governments, entities, organizations, and individuals for climate change,

when economic analyses of climate change policy options can prescribe or limit national duties or obligations to respond to the threat of climate change,

ethical and justice implications of decisions must be made in the face of scientific uncertainty,

whether action or non-action of other nations is relevant to any nation’s responsibility for climate change,

how to spend limited funds on climate change adaptation,

when politicians may rely on their own uninformed opinion about climate change science,

who is responsible for climate refugees and what their responsibilities are.

On some of these issues, the recent IPCC report included a good summary of the extant ethical literature, on other issues important gaps in IPCC’s analysis can be identified, and lastly on a few of these issues, IPCC Working Group III is silent. IPCC reports cannot be expected to be exhaustive on these matters and therefore gaps and omissions in the IPCC reports in regard to ethics and justice issues relevant to policy-making is not necessarily a criticism of IPCC and is here pointed out only for future consideration. In fact, IPCC’s work on the ethical limits of economic arguments is a particularly important contribution to the global climate change debate. What is worthy of criticism, however, is if IPCC’s conclusions on guidance for policy-makers is misleading on ethics and justice issues.

II. Ethical Issues Raised by Economic Arguments About Climate Policy

Perhaps the most important practical ethical and justice issues raised by Working Group III’s work on ethics is its conclusions on the ethical and justice limitations of economic analyses of climate change policy options. This topic is enormously practically important because nations and others who argue against proposed climate change policies usually rely on various economic arguments which often completely ignore the ethical and justice limitations of these arguments (In the case of the United States, see Brown, 2012.) Because most citizens and policy-makers have not been trained in spotting ethically dubious claims that are often hidden in what appear at first glance to be “value-neutral” economic arguments, IPCC’s acknowledgement of the ethical limitations of economic arguments is vitally important. It is also practically important because the first four IPCC reports, although not completely ignoring all ethical and justice problems with economic arguments about climate change policies, failed to examine the vast majority of ethical problems with economic arguments against climate change policies while making economic analyses of climate change policies the primary focus of Working Group III’s work thereby leaving the strong impression that economic analyses, including but not limited to cost-benefit analyses, is the preferred way to evaluate the sufficiency of proposed climate change policies. On this matter, the AR5 report has made important clarifications.

The AR5 III report included a section on this very issue entitled: Economics, Rights, and Dutieswhich we reproduce here it its entirety because of its importance to this discussion, followed by comments in bold italics:

Economics can measure and aggregate human wellbeing, but Sections 3.2, 3.3 and 3.4 explain that wellbeing may be only one of several criteria for choosing among alternative mitigation policies.

Other ethical considerations are not reflected in economic valuations, and those considerations may be extremely important for particular decisions that have to be made. For example, some have contended that countries that have emitted a great deal of GHG in the past owe restitution to countries that have been harmed by their emissions. If so, this is an important consideration in determining how much finance rich countries should provide to poorer countries to help with their mitigation efforts. It suggests that economics alone cannot be used to determine who should bear the burden of mitigation.

What ethical considerations can economics cover satisfactorily? Since the methods of economics are concerned with value, they do not take into account of justice and rights in general. However, distributive justice can be accommodated within economics, because it can be understood as a value: specifically the value of equality. The theory of fairness within economics (Fleurbaey, 2008) is an account of distributive justice. It assumes that the level of distributive justice within a society is a function of the wellbeings of individuals, which means it can be reflected in the aggregation of wellbeing. In particular, it may be measured by the degree of inequality in wellbeing, using one of the standard measures of inequality such as the Gini coefficient (Gini, 1912), as discussed in the previous section. The Atkinson measure of inequality (Atkinson, 1970) is based on an additively separable social welfare function (SWF), and is therefore particularly appropriate for representing the prioritarian theory described in Section 3.4.6 . Furthermore, distributive justice can be reflected in weights incorporated into economic evaluations as Section 3.6 explains.

Simply identifying the level of inequality using the Gini Index does not assure that the harms and benefits of climate change policies will be distributed justly. For that a theory of just distribution is needed. The Gini index is also at such a level of abstraction that it is very difficult to use it as a way of thinking about the justice obligations to those most vulnerable to climate change. Even if there is strong economic equality in a nation measured by the Gini index, one cannot conclude that climate change policies are distributively just.

Economics is not well suited to taking into account many other aspects of justice, including compensatory justice. For example, a CBA might not show the drowning of a Pacific island as a big loss, since the island has few inhabitants and relatively little economic activity. It might conclude that more good would be done in total by allowing the island to drown: the cost of the radical action that would be required to save the island by mitigating climate change globally would be much greater than the benefit of saving the island. This might be the correct conclusion in terms of overall aggregation of costs and benefits. But the island’s inhabitants might have a right not to have their homes and livelihoods destroyed as a result of the GHG emissions of richer nations far away. If that is so, their right may override the conclusions of CBA. It may give those nations who emit GHG a duty to protect the people who suffer from it, or at least to make restitution to them for any harms they suffer.

Even in areas where the methods of economics can be applied in principle, they cannot be accepted without question (Jamieson, 1992; Sagoff, 2008). Particular simplifying assumptions are always required, as shown throughout this chapter. These assumptions are not always accurate or appropriate, and decision‐makers need to keep in mind the resulting limitations of the economic analyses. For example, climate change will shorten many people’s lives. This harm may in principle be included within a CBA, but it remains highly contentious how that should be done. Another problem is that, because economics can provide concrete, quantitative estimates of some but not all values, less quantifiable considerations may receive less attention than they deserve.

This discussion does not adequately capture serious ethical problems with translating all values into monetary units measured by willingness to pay or its surrogates nor that such transformation may greatly distort ethical obligations to do no harm into changes in commodity value.

The extraordinary scope and scale of climate change raises particular difficulties for economic methods (Stern, forthcoming). First, many of the common methods of valuation in economics are best designed for marginal changes, whereas some of the impacts of climate change and efforts at mitigation are not marginal (Howarth and Norgaard, 1992). Second, the very long time scale of climate change makes the discount rate crucial at the same time as it makes it highly controversial (see Section 3.6.2 ). Third, the scope of the problem means it encompasses the world’s extremes of wealth and poverty, so questions of distribution become especially important and especially difficult. Fourth, measuring non‐market values—such as the existence of species, natural environments, or traditional ways of life of local societies—is fraught with difficulty. Fifth, the uncertainty that surrounds climate change is very great. It includes the likelihood of irreversible changes to societies and to nature, and even a small chance of catastrophe. This degree of uncertainty sets special problems for economics. (Nelson, 2013) (IPCC, 2014.WG III, Ch. 3, pg. 12-13)

Again this discussion does not adequately describe the ethical problems with economic determinations of all values. In fact it leaves the impression that if non-market values can be discovered the problems of transforming all values to commodity values are adequately dealt with.

Chapter 3, also includes additional statements about the ethical limits of economic reasoning sprinkled throughout the chapter. They include:

2. However, the methods of economics are limited in what they can do. They can be based on ethical principles, as Section 3.6 explains. But they cannot take account of every ethical principle. They are suited to measuring and aggregating the wellbeing of humans, but not to taking account of justice and rights (with the exception of distributive justice − see below), or other values apart from human wellbeing. (IPCC, 2014.WG III, Ch. 3, pg. 24)

And so Chapter 3 of the IPCC report contains a number or clear assertions about the ethical limitations of economic arguments. However there are important gaps missing from this analysis. Also several sections of Chapter 3 that can be interpreted as claims that policy makers are free to choose economic reasoning as justification for climate policies. That is, some of the text reads as if a policy-maker is free to choose whether to base policy on economic or ethical and justice considerations, choosing between these two ways of evaluation is simply an option. Some of these provisions follow with responses in italics

Chapter 3 page 6 says:

Many different analytic methods are available for evaluating policies. Methods may be quantitative (for example, cost‐benefit analysis, integrated assessment modeling, and multi‐criteria analysis) or qualitative (for example, sociological and participatory approaches). However, no single best method can provide a comprehensive analysis of policies. A mix of methods is often needed to understand the broad effects, attributes, trade‐offs, and complexities of policy choices; moreover, policies often address multiple objectives (IPCC, 2014.WG III, Ch. 3, pg. 6)

Although economic analyses can provide policy-makers with valuable information such as which technologies will achieve ethically determined goals at lowest cost, thereby providing criteria for making remedies cost-effective, there are serious ethical problems with cost-benefit analyses used prescriptively to set emissions reductions targets. Some of these are alluded to in IPCC Chapters 3 and 4, others are not acknowledged. Because of the prevalence of cost-benefit justifications for climate change policies, future IPCC reports could make a contribution by identifying all of the ethical issues raised by cost-benefit analyses.

Any decision about climate change is likely to promote some values and damage others. These may be values of very different sorts. In decision making, different values must therefore be put together or balanced against each other. (IPCC, 2014. WG III, Ch. 3, pg. 6)

This provision can be understood as condoning a consequentialist approach to climate policy that fails to acknowledge deontological limits. Since when any nation makes policy on climate change it affects poor people and vulnerable nations around the world, there are serious procedural justice issues which go unacknowledged in this section and, for the most part, all throughout Chapter 3. Nowhere does the chapter acknowledge that when a climate policy is under development at the national level, nations have no right to compare costs to them of implementing policies with the harms to others that have not consented to the method of valuation being used to determine quantitative value.

Ideally, emissions should be reduced in each place to just the extent that makes the marginal cost of further reductions the same everywhere. One way of achieving this result is to have a carbon price that is uniform across the world; or it might be approximated by a mix of policy instruments (see Section 3.8 ). (IPCC, 2014.WG III, Ch. 3, pg. 26)

This statement fails to acknowledge that emissions reductions amounts should be different in different places according to well accepted principles of distributive justice. Although other sections of the chapter acknowledge that responsibility for climate change is a matter of distributive justice, this section and others leave the impression that climate policy can be based upon economic efficiency grounds alone. The way to cure this problem is to continue to reference other sections that recognize ethical limits in setting policy on the basis of efficiency.

(IPCC, 2014.WG III, Ch. 3, pg. 6)

Since, for efficiency, mitigation should take place where it is cheapest, emissions of GHG should be reduced in many developing countries, as well as in rich ones. However, it does not follow that mitigation must be paid for by those developing countries; rich countries may pay for mitigation that takes place in poor countries. Financial flows between countries make it possible to separate the question of where mitigation should take place from the question of who should pay for it. Because mitigating climate change demands very large‐scale action, if put in place these transfers might become a significant factor in the international distribution of wealth. Provided appropriate financial transfers are made, the question of where mitigation should take place is largely a matter for the economic theory of efficiency, tempered by ethical considerations. But the distribution of wealth is amatter of justice among countries, and a major issue in the politics of climate change (Stanton, 2011). It is partly a matter of distributive justice, which economics can take into account, but compensatory justice may also be involved, which is an issue for ethics. (Section 3.3).(IPCC, 2014.WG III, Ch. 3, pg. 26)

There are a host of potential ethical problems with mitigation taking place in one part of the world to satisfy the ethical obligations of a nation in another part of the world which is emitting above its fair share of safe global emissions that are not mentioned in this article. Included in these problems are:

Environmental Sufficiency. There are many technical challenges in assuring that a project in one part of the world that seeks to reduce ghg by an amount that otherwise would be required of a polluter will actually succeed in achieving the reductions particularly when the method of reduction is reliant on biological removal of carbon.

Permanence. Many proposed projects for reducing carbon in one part of the world to offset reductions ethically required in another part of the world raise serious questions about whether the carbon reduced by the project will stay out of the atmosphere forever, a requirement that is required to achieve the environmental equivalence to ghg emissions reductions that would be achieved at the source.

Leakage. Many proposed projects used to offset emissions reductions of high-emitters raise serious questions about whether carbon reduced by a project at one location will result in actual reductions in emissions because the activity which is the subject of the offset is resumed at another location.

Additionality. A project that is proposed in another part of the world to offset emissions reductions of a high-emitting entity may not be environmentally effective if the project would have happened anyway for other reasons.

Allowing Delay In Investing In New Technology. The ability to rely on a cheaper emissions reductions project in another part of the world as a substitute of reducing emissions creates an excuse for high-emitting entities to delay investment in technologies that will reduce the pollution load. This may create a practical problem when emissions reductions obligations are tightened in the future.

Chapter 3 also treats other important ethical issues that arise in climate change policy formation. They include:

Some of the gaps in Chapter 3 on ethical issues raised by climate change policy-making include: (1) ethics of decision-making in the face of scientific uncertainty, (2) whether action or non-action of other nations affects a nation’s responsibility for climate change, (3) how to spend limited funds on climate change adaptation, (4) when politicians may rely on their own uninformed opinion about climate change science, and (5) who is responsible to for climate refugees and what are their responsibilities.

The last entry in this series will continue the analyses of IPCC Chapter 3 on Social, Economic, and Ethical Concepts and Chapter 4 on Sustainability and Equity.

As we have explained from many angles on this website, climate change is a civilization challenging ethical problem. We have also explained why nations urgently need to immediately respond to their ethical obligations in making national emissions commitments under the UNFCCC. In addition, ethics requires those engaged in dangerous behavior to understand the effects of their policy choices and respond to their ethical obligations. Yet complex interactions of ghg emissions levels, atmospheric ghg concentrations, the climate system’s response to atmospheric ghg concentrations, and how policy options must consider the magnitude of the global threat as it changes in time make it difficult for policy makers and NGOs to visualize and understand the significance of climate policy choices. And so ethics requires policy makers to understand these complex interactions, yet the sheer complexity of these interactions makes clear understanding of the significance of policy options very challenging.

We have also explained on this website how the debate on climate change in the United States and several other high-emitting nations is largely ignoring national ethical responsibilities. If nations are to take their ethical obligations seriously, they need to understand the extreme urgency of increasing their ghg emissions reduction targets to comply with their ethical obligations. Yet to understand their ethical obligations policy-makers must understand the significance of policy choices. And so ethics requires climate change policy-makers to understand many complex scientific issues.

Ethics would also hold nations morally responsible for the failure to do this. Delay makes the climate change problem worse. Yet understanding how delay makes achieving the goals of preventing dangerous climate change extraordinarily more challenging also requires some knowledge about how increasing atmospheric concentrations affect global emissions reductions pathways options. In addition, because each national emission reduction target commitment must be understood as an implicit position of the nation on safe ghg atmospheric concentration levels, setting national ghg emissions goals must be set with full knowledge of how any national target will affect the global problem.

However, a clear understanding of how national emissions reductions commitments affect global climate change impacts requires an understanding of complex relationships between atmospheric ghg concentrations, likely global temperature changes in response to ghg atmospheric concentrations, rates of ghg emissions reductions over time and all of this requires making assumptions about how much CO2 from emissions will remain in the atmosphere, how sensitive the global climate change is to atmospheric ghg concentrations, and when the international community begins to get on a serious emissions reduction pathway guided by equity considerations. The problem in understanding these variables is a challenge that no static graph can capture.

A new website should be of great value to policy-makers to view and understand the relationship between their national emissions reduction strategies and the global climate change problem, issues that must be considered in setting national ghg targets as a matter of ethics. This tool is the Carbon Budget Accounting Tool (CBAT) which is available at http://www.gci.org.uk/cbat-domains/Domains.swf

Some features of CBAT are still under development, yet the site is already practically useful to policy-makers.

The CBAT has been developed by the Global Commons Institute founded in the United Kingdom in 1990 by Aubrey Meyer as an organization to find to a fair way to tackle climate change.

The CBAT tool allows visualization of any national response for reducing national ghg emissions commitments based upon the idea of contraction and convergence, one of several equity frameworks under discussion in international climate negotiations, but is also of value for visualizing the policy significance of other equity frameworks that are under discussion internationally.

The CBAT model should be very useful for all who hope to understand future climate change policy options and the scale of the global challenge facing the world. This writer has been engaged in climate change policy options since the 1992 Earth Summit at which the United Nations Framework Convention was opened for signature and have attended most of the Conference of Parties under the UNFCCC since then. Yet even though I have significant experience and knowledge about future climate change policy challenges, the CBAT model helps me visualize the significance of certain policy options facing the world.

Because ethics requires policy-makers to understand the policy implications of their policies, understanding the complex interactions of the variables displayed on the CBAT is indispensable for national climate change policy-makers as a matter of ethics.

This 11 minute video examines why politicians, unlike many ordinary citizens, may not rely upon their own uninformed opinion on climate change science as a basis for refusing to support climate change policies. The video argues that politicians have responsibilities that ordinary citizens do not have to protect others from harms that their constituents are causing others.

Marco Rubio, a US Senator from Florida, recently said that he was not sure the climate change was human caused. This is one of the reasons why he’s unwilling to support US government action to reduce the threat of climate change. Many other US politicians have also recently said they will not support legislation to reduce US greenhouse gas emissions because they are not convinced that climate change happening or is human-caused. In fact, 7 out of 8 Republican candidates for the US presidency proclaimed they didn’t believe that climate change was a problem. (Skeptical Science) When these politicians are asked about the basis for their positions on climate change, they almost always respond by saying such things as they “have heard that there is a disagreement among scientists” or similar responses that strongly suggest they have informed an opinion on climate change science without any understanding of the depth of the scientific evidence on which the scientific consensus view 0f climate change has been based. For instance, US politicians frequently assert that it is an open question whether humans are causing the undeniable warming that the Earth is experiencing, thus exposing ignorance of dozens of lines of independent robust evidence of human causation including attribution studies, finger print analyses, strong evidence that correlates fossil fuel use to rising atmospheric concentrations of greenhouse gases, and other physical and chemical evidence.

Although ordinary individuals may have no duty to go beyond their own personal opinion about the science of climate change, government officials who have the power to enact policies that could present catastrophic harm to millions of people around the world may not as a matter of ethics justify their refusal to support policies to reduce the threat of climate change on the basis of their uninformed opinions on climate science. This is so because government officials, unlike ordinary citizens, have the power to prevent or minimize great harms to millions of people around the world that mainstream scientists have concluded that their constituents or governments that they represent are causing or contributing to. That is, a government officials have more responsibility than the average citizen to understand the state of climate change science because the government official can uniquely prevent harm that their constituents or governments are causing. And so, when government officials with the power to enact climate change policies are on notice that respectable scientific evidence supports the conclusion that their constituents or governments are likely causing great harm, they may not appeal to their uninformed opinion on climate science as justification for not taking action.

The government official is like the railroad official who has been told by employees who are in a position to know the location of the company’s trains that there is a runaway train hurtling toward a bus full of children that is stuck on the track, when the official has the ability to divert the train onto a track on which no humans will be harmed.

In the case of climate change, government officials should know that 97 of every 100 scientists that actually do peer-reviewed climate science research and in the United States by the most prestigious scientific organizations including the US National Academy of Sciences that greenhouse gases coming from his constituents threaten catastrophic harm not only to his constituents but to millions of people around the world, most of whom have done little to cause climate change.

In the case of climate change, the US politician not only has the power, working with colleagues, to prevent great harm caused by his or her constituents, he or she has the responsibility to prevent his or her constituents from harming others outside United States. This responsibility was expressly agreed to by the United States when it ratified the United Nations Convention on Climate Change which contains the following acknowledgment of the US governments responsibility to prevent harm to those outside the United States in the convention’s Preamble:

Recalling also that States have, in accordance with the Charter of the United Nations and the principles of international law, the sovereign right to exploit their own resources pursuant to their own environmental and developmental policies, and the responsibility to ensure that activities within their jurisdiction or control do not cause damage to the environment of other States or of areas beyond the limits of national jurisdiction.(UNFCCC Preamble)

In the case of climate change, the people that will be harmed (those in our metaphorical bus) are not only the constituents of the politician but hundreds of millions of people around the world that have done little or nothing to cause climate change.

The vast majority of climate scientists and over 100 scientific organizations whose members have climate science expertise have concluded that humans are causing climate change and human-induced climate change creates catastrophic threats for the human race and particularly for hundreds of millions of poor people around the world who are most vulnerable to climate change impacts. Although there are some differences among some mainstream scientists about some of the details of the consensus view, an open letter from the American Association for the Advancement of Science’s which was endorsed by 18 of the most prestigious scientific organizations in the United States summed up the nature of the scientific consensus as follows:

As you consider climate change legislation, we, as leaders of scientific organizations, write to state the consensus scientific view. Observations throughout the world make it clear that climate change is occurring, and rigorous scientific research demonstrates that the greenhouse gases emitted by human activities are the primary driver. These conclusions are based on multiple independent lines of evidence, and contrary assertions are inconsistent with an objective assessment of the vast body of peer- reviewed science. (AAAS 2009)

Though scientific consensus must always be open to responsible skepticism given: (a) the strength of the consensus on this topic, (b) the enormity of the harms predicted by the consensus view, (c) an approximately 30 year delay in taking action that has transpired since a serious climate change debate began in the United States in the early 1980s, (d) a delay that has made the problem worse while making it more difficult to achieve ghg emissions reductions necessary to prevent dangerous climate change because of the steepness of reductions now needed, no politician can ethically justify his or her refusal to support action on climate change based upon a personal opinion that is not supported by strong scientific evidence that has been reviewed by scientific organizations with a wide breadth of interdisciplinary scientific expertise. Because any further delay will make the climate change threat worse, US politicians have a duty to support policies that will reduce the threat of climate unless they can produce strong scientific evidence that has been fully vetted by respectable scientific institutions that climate change is not the threat entailed by the scientific consensus view.

In this situation the government official has a strong duty to go beyond his or her own uninformed opinion about whether humans are causing dangerous climate change. They must justify their refusal to act on strong, peer-reviewed scientific evidence that is accepted by mainstream scientific institutions that have the breadth of expertise to consider one study in the context of thousands of other studies in climate change science. And so, government officials may not justify their refusal to act simply on the basis of their personal opinion.

Because politicians have an affirmative duty to initially rely upon mainstream scientific views in regard to human activities that could cause great harm, the press has a journalistic duty to help citizens understand any politician’s views that oppose action on climate change policies on scientific grounds. The US press has almost always failed to probe the justifications of those opposing action on climate change on scientific grounds. For this reason, journalists should ask politicians that claim there is not sufficient scientific support for government action climate change the following questions:

1. What specific scientific references and sources do you rely upon to conclude that there is a reasonable scientific dispute about whether human actions are causing dangerous climate change?

2. Are you aware that the United States Academy of Sciences and almost all respected scientific organizations whose membership includes scientists with expertise relevant to climate change science support the scientific consensus view that holds has that the planet is warming, that the warming is mostly human caused, and that harsh impacts from warming are very likely under business-as-usual?

3. On what basis do you disregard the conclusions that humans are causing dangerous climate change held by the United States Academy of Sciences, over a hundred scientific organizations whose membership includes experts with expertise relevant to the science of climate change, and 97 percent of scientists who actually do peer-reviewed research on climate change?

4. When you claim that the United States need not adopt climate change policies because adverse climate change impacts have not yet been proven, are you claiming that climate change skeptics have proven that human-induced climate change will not create adverse impacts on human health and the ecological systems of others on which their life often depends and if so what is that proof?

5. When you claim that the United States should not adopt climate change policies because there is scientific uncertainty about adverse climate change impacts, are you arguing that no action of climate change should be taken until all scientific uncertainties are resolved given that waiting to resolve all scientific uncertainties before action is taken will very likely make it too late to prevent dangerous human-induced climate change harms according to the consensus view?

6. Do you deny that those who argue that they should be allowed to continue to emit greenhouse gases at levels that may be dangerous should assume the burden of proof that their actions are safe given the strength of the consensus view on climate change science?

7. Do you deny that those who are most vulnerable to climate change’s harshest potential impacts have a right to participate in a decision about whether to act to reduce the threat of climate change in the face of scientific uncertainty?

8. Given that in ratifying the United Nations Framework Convention on Climate Change (UNFCCC) the Untied States in 1992 agreed to the following under Article 3, do you believe the United States is now free to ignore this promise by refusing to take action on climate change on the basis of scientific uncertainty?

The Parties should take precautionary measures to anticipate, prevent or minimize the causes of climate change and mitigate its adverse effects. Where there are threats of serious or irreversible damage, lack of full scientific certainty should not be used as a reason for postponing such measures, taking into account that policies and measures to deal with climate change should be cost-effective so as to ensure global benefits at the lowest possible cost.

9. If you claim that the climate change impacts predicted by the Intergovernmental Panel on Climate Change (IPCC) have not reached a level of scientific certainty that warrants action, do you agree that climate change impacts predicted by IPCC could be wrong in both directions, potentially leading to even harsher adverse impacts than those predicted?

10. Given that for over 20 years since international climate change negotiations began, the United States has refused to commit to reduce its greenhouse gas emissions based upon the justification that there is too much scientific uncertainty to warrant action, if it turns out that human-induced climate change actually greatly harms the health and ecological systems on which life depends of others, should the United States be responsible for the harms that could have been avoided if preventative action had been taken earlier?